2. 外语
  3. According to the passage, scientists have discovered that influenza viruses ______ . What is known about the influenza virus?

According to the passage, scientists have discovered that influenza viruses ______ . What is known about the influenza virus?

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问题 According to the passage, scientists have discovered that influenza viruses ______ .
What is known about the influenza virus?
选项 A、It was first found in a group of very old birds.
B、All the different strains can be found in wild birds.
C、It existed over 100 million years ago.
D、It can survive in many different places.
答案D
解析
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